/** * Copyright (c) 2012 - 2018, Nordic Semiconductor ASA * * All rights reserved. * * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, this * list of conditions and the following disclaimer. * * 2. Redistributions in binary form, except as embedded into a Nordic * Semiconductor ASA integrated circuit in a product or a software update for * such product, must reproduce the above copyright notice, this list of * conditions and the following disclaimer in the documentation and/or other * materials provided with the distribution. * * 3. Neither the name of Nordic Semiconductor ASA nor the names of its * contributors may be used to endorse or promote products derived from this * software without specific prior written permission. * * 4. This software, with or without modification, must only be used with a * Nordic Semiconductor ASA integrated circuit. * * 5. Any software provided in binary form under this license must not be reverse * engineered, decompiled, modified and/or disassembled. * * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * */ /** @file * * @defgroup app_gpiote GPIOTE Handler * @{ * @ingroup app_common * * @brief GPIOTE handler module. * * @details The GPIOTE handler allows several modules ("users") to share the GPIOTE interrupt, * each user defining a set of pins able to generate events to the user. * When a GPIOTE interrupt occurs, the GPIOTE interrupt handler will call the event handler * of each user for which at least one of the pins generated an event. * * The GPIOTE users are responsible for configuring all their corresponding pins, except * the SENSE field, which should be initialized to GPIO_PIN_CNF_SENSE_Disabled. * The SENSE field will be updated by the GPIOTE module when it is enabled or disabled, * and also while it is enabled. * * The module specifies on which pins events should be generated if the pin(s) goes * from low->high or high->low or both directions. * * @note Even if the application is using the @ref app_scheduler, the GPIOTE event handlers will * be called directly from the GPIOTE interrupt handler. * * @warning If multiple users registers for the same pins the behavior for those pins are undefined. */ #ifndef APP_GPIOTE_H__ #define APP_GPIOTE_H__ #include #include #include "nrf.h" #include "nrf_drv_gpiote.h" #include "app_error.h" #include "app_util.h" #ifdef __cplusplus extern "C" { #endif #define GPIOTE_USER_NODE_SIZE ((4*sizeof(uint32_t)*GPIO_COUNT)+8) /**< Size of app_gpiote.gpiote_user_t (only for use inside APP_GPIOTE_BUF_SIZE()). */ /**@brief Compute number of bytes required to hold the GPIOTE data structures. * * @param[in] MAX_USERS Maximum number of GPIOTE users. * * @retval Required buffer size (in bytes). */ #define APP_GPIOTE_BUF_SIZE(MAX_USERS) ((MAX_USERS) * GPIOTE_USER_NODE_SIZE) typedef uint8_t app_gpiote_user_id_t; /**@brief GPIOTE event handler type. */ typedef void (*app_gpiote_event_handler_t)(uint32_t const * p_event_pins_low_to_high, uint32_t const * p_event_pins_high_to_low); /**@brief GPIOTE input event handler type. */ typedef void (*app_gpiote_input_event_handler_t)(void); /* Make the pin config descriptor packed */ #pragma pack(push, 1) /** * @brief Single pin configuration * * Structure used to describe single pin configuration * when registering user. * @sa app_gpiote_user_register_ex */ typedef struct { /** Pin number to observe */ uint32_t pin_number : VBITS(NRF_GPIO_PIN_MAP(GPIO_COUNT - 1, 31)); /** Transition to observe */ nrf_gpiote_polarity_t sense : 2; } app_gpiote_user_pin_config_t; // Check if we can fitt all the nrf_gpiote_polarity_t values into 2 bits field STATIC_ASSERT(NRF_GPIOTE_POLARITY_LOTOHI <= 3); STATIC_ASSERT(NRF_GPIOTE_POLARITY_HITOLO <= 3); STATIC_ASSERT(NRF_GPIOTE_POLARITY_TOGGLE <= 3); #pragma pack(pop) /**@brief Macro for initializing the GPIOTE module. * * @details It will handle dimensioning and allocation of the memory buffer required by the module, * making sure that the buffer is correctly aligned. * * @param[in] MAX_USERS Maximum number of GPIOTE users. * * @note Since this macro allocates a buffer, it must only be called once (it is OK to call it * several times as long as it is from the same location, e.g. to do a reinitialization). */ /*lint -emacro(506, APP_GPIOTE_INIT) */ /* Suppress "Constant value Boolean */ #define APP_GPIOTE_INIT(MAX_USERS) \ do \ { \ static uint32_t app_gpiote_buf[CEIL_DIV(APP_GPIOTE_BUF_SIZE(MAX_USERS), sizeof(uint32_t))];\ uint32_t ERR_CODE = app_gpiote_init((MAX_USERS), app_gpiote_buf); \ APP_ERROR_CHECK(ERR_CODE); \ } while (0) /**@brief Function for initializing the GPIOTE module. * * @note Normally initialization should be done using the APP_GPIOTE_INIT() macro, as that will * allocate the buffer needed by the GPIOTE module (including aligning the buffer correctly). * * @param[in] max_users Maximum number of GPIOTE users. * @param[in] p_buffer Pointer to memory buffer for internal use in the app_gpiote * module. The size of the buffer can be computed using the * APP_GPIOTE_BUF_SIZE() macro. The buffer must be aligned to * a 4 byte boundary. * * @retval NRF_SUCCESS Successful initialization. * @retval NRF_ERROR_INVALID_PARAM Invalid parameter (buffer not aligned to a 4 byte * boundary). */ uint32_t app_gpiote_init(uint8_t max_users, void * p_buffer); /**@brief Function for registering a GPIOTE user. * * @param[out] p_user_id Id for the new GPIOTE user. * @param[in] p_pins_low_to_high_mask Pointer to word array with mask defining which pins * will generate events to this user when state is changed * from low->high. Size of array depends on number of ports * in the device. * @param[in] p_pins_high_to_low_mask Pointer to word array with mask defining which pins * will generate events to this user when state is changed * from high->low. Size of array depends on number of ports * in the device. * @param[in] event_handler Pointer to function to be executed when an event occurs. * Cannot be NULL. * * @retval NRF_SUCCESS Successful initialization. * @retval NRF_ERROR_INALID_STATE If @ref app_gpiote_init has not been called on the GPIOTE * module. * @retval NRF_ERROR_NO_MEM Returned if the application tries to register more users * than defined when the GPIOTE module was initialized in * @ref app_gpiote_init. * * @note The function can also return error codes from internally * called @ref nrf_drv_gpiote_in_init * * @sa app_gpiote_user_register_ex */ uint32_t app_gpiote_user_register(app_gpiote_user_id_t * p_user_id, uint32_t const * p_pins_low_to_high_mask, uint32_t const * p_pins_high_to_low_mask, app_gpiote_event_handler_t event_handler); /**@brief Function for registering GPIOTE user using pins configuration list. * * Function for registering GPIOTE user that uses array of pins configuration. * This function do not change pins configuration. * Pins must be configured before calling this function. * * @param[out] p_user_id Id for the new GPIOTE user. * @param[in] p_pins_config Pointer to the array of pins configuration for the user. * @param[in] pin_count Number of pins to configure for the user. * @param[in] event_handler Pointer to function to be executed when an event occurs. * Cannot be NULL. * * @retval NRF_SUCCESS Successful user registration. * @retval NRF_ERROR_INVALID_STATE If @ref app_gpiote_init has not been called before calling * this function. * @retval NRF_ERROR_NO_MEM Returned if the application tries to register more users * than defined when the GPIOTE module was initialized in * @ref app_gpiote_init. * * @note The function can also return error codes from internally * called @ref nrf_drv_gpiote_in_init * * @sa app_gpiote_user_register */ uint32_t app_gpiote_user_register_ex(app_gpiote_user_id_t * p_user_id, app_gpiote_user_pin_config_t const * p_pins_config, size_t pin_count, app_gpiote_event_handler_t event_handler); /**@brief Function for informing the GPIOTE module that the specified user wants to use the GPIOTE module. * * @param[in] user_id Id of user to enable. * * @retval NRF_SUCCESS On success. * @retval NRF_ERROR_INVALID_PARAM Invalid user_id provided, No a valid user. * @retval NRF_ERROR_INALID_STATE If @ref app_gpiote_init has not been called on the GPIOTE * module. */ uint32_t app_gpiote_user_enable(app_gpiote_user_id_t user_id); /**@brief Function for informing the GPIOTE module that the specified user is done using the GPIOTE module. * * @param[in] user_id Id of user to enable. * * @retval NRF_SUCCESS On success. * @retval NRF_ERROR_INVALID_PARAM Invalid user_id provided, No a valid user. * @retval NRF_ERROR_INALID_STATE If @ref app_gpiote_init has not been called on the GPIOTE * module. */ uint32_t app_gpiote_user_disable(app_gpiote_user_id_t user_id); /**@brief Function for getting the state of the pins which are registered for the specified user. * * @param[in] user_id Id of user to check. * @param[out] p_pins Pointer to array of words with bit mask corresponding to the pins * configured to generate events to the specified user. All bits * corresponding to pins in the state 'high' will have value '1', * all others will have value '0'. Size of array depends on number * of ports in the device. * * @retval NRF_SUCCESS On success. * @retval NRF_ERROR_INVALID_PARAM Invalid user_id provided, No a valid user. * @retval NRF_ERROR_INALID_STATE If @ref app_gpiote_init has not been called on the GPIOTE * module. */ uint32_t app_gpiote_pins_state_get(app_gpiote_user_id_t user_id, uint32_t * p_pins); #ifdef __cplusplus } #endif #endif // APP_GPIOTE_H__ /** @} */